Electronic Pedestrian Protection Module (EPPM)

B2722-00-EPPM UNLOCKED - ALL DEPLOYMENT DISABLED

Theory of Operation

All Electronic Pedestrian Protection Module (EPPM) modules destined for service part usage are shipped in a state that inhibits the deployment of all supplemental restraint squib circuits (EPPM unlocked) for safe, initial installation. Once the EPPM initialization procedure is performed (EPPM locked). The EPPM enters a full state of readiness and can no longer transition to the unlocked status.

- When Monitored:
The EPPM will detect the Deployment Disable Status (EPPM LOCKED, EPPM UNLOCKED or EPPM IS RESPONDING WITH INCORRECT DATA) as soon as the ignition is turned on and the power is supplied to the new EPPM.

- Set Condition:
This DTC will be set as active for all service replacement EPPM modules prior to the initialization procedure (EPPM locked). This DTC is Active within four to six seconds for the EPPM unlocked state at start up. The DTC will change from Active to non Active state immediately upon the EPPM state changing to locked. The EPPM module will not show this DTC as Stored. It will just not show the DTC in a Stored state. Supply voltage range is 9 - 16 volts.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. EPPM System Pre-Diagnostic Procedure.

Diagnostic Test

1. CHECK FOR ADDITIONAL ACTIVE EPPM DTCS

NOTE: Make sure the battery is fully charged.

1. Turn the ignition on.
2. With the scan tool, read the active EPPM DTC.

Is B2769-00-EPPM UNLOCKED - ALL DEPLOYMENT DISABLED the only active DTC?

Yes

- Go To 2

No

- Diagnose and repair the DTC(s). Testing and Inspection.

2. INITIALIZE EPPM
1. With the scan tool, select Initialize EPPM.
2. The Scan Tool will display the current Deployment Disable Status (CURRENT STATUS)

Select the CURRENT STATUS displayed on the Scan Tool.

CURRENT STATUS

- LOCKED
- The EPPM is in a full state of readiness.
- Perform the EPPM SYSTEM VERIFICATION TEST. EPPM System Verification Test.

CURRENT STATUS

- UNLOCKED
- Go To 3

CURRENT STATUS

- EPPM is Responding with incorrect Data
- With the scan tool, select MISC. FUNCTION or DIAGNOSTICS PROCEDURES and then EPPM RESET.
- After the EPPM RESET is complete: Restart this test at step 1.
- Go To 1

3. CHANGE EPPM STATUS
1. Follow the instruction on the screen to change the status to LOCKED.
2. The Scan Tool will display the result of the initialization.

Does the Scan Tool display: EPPM LOCK Successful?

Yes

- CURRENT STATUS is EPPM LOCK Successful
- Perform the EPPM SYSTEM VERIFICATION TEST. EPPM System Verification Test.

No

- Go To 4

4. INCOMPLETE OR FAILED EPPM INITIALIZATION

Does the Scan Tool display: EPPM Initialization Failed?

Yes

- CURRENT STATUS is EPPM Initialization Failed

WARNING:
Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

WARNING:
If the Electronic Pedestrian Protection Module (EPPM) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental actuator deployment. Failure to follow these instructions may result in possible serious or fatal injury.

- Replace the EPPM. Electronic Pedestrian Protection Module - Removal.
- Perform the EPPM SYSTEM VERIFICATION TEST. EPPM System Verification Test.

No

- CURRENT STATUS is Current and original VIN have not been learned by EPPM.
- With the scan tool, select MISC. FUNCTION or DIAGNOSTICS PROCEDURES and then EPPM RESET.
- After the RESET is complete: Restart this test at step 1.
- Go To 1